package com.wsz.filter;

import com.auth0.jwt.interfaces.DecodedJWT;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.wsz.pojo.R;
import com.wsz.utils.JwtUtils;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import static org.springframework.http.HttpHeaders.AUTHORIZATION;

public class CustomAuthorizationFilter extends OncePerRequestFilter {
    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {

        if(request.getServletPath().equals("/login") || request.getServletPath().equals("/token/refresh")){
            filterChain.doFilter(request,response);
        }else{
            String header = request.getHeader(AUTHORIZATION);
            if(header != null && header.startsWith("token:")){
                try{
                    String token = header.substring("token:".length());
                    DecodedJWT decodedJWT = JwtUtils.parseToken(token);
                    String username = decodedJWT.getIssuer();
                    String id = decodedJWT.getSubject();

                    Map<String,String> data = new HashMap<>();
                    data.put("username",username);
                    data.put("id",id);

                    UsernamePasswordAuthenticationToken usernamePasswordAuthenticationToken
                            = new UsernamePasswordAuthenticationToken(data,null,null);

                    SecurityContextHolder.getContext().setAuthentication(usernamePasswordAuthenticationToken);

                    filterChain.doFilter(request,response);
                }catch (Exception e){
                    R r = R.error().message(e.getMessage());
                    response.setContentType("application/json;UTF-8");
                    new ObjectMapper().writeValue(response.getOutputStream(),r);
                }
            }else{
                filterChain.doFilter(request,response);
            }
        }
    }
}